Wykonajmy obliczenia.

a)

$0,817\cdot 12=9,804$

$\begin{array}{r}0,817\\ \underline{\cdot 12}\\ 1634\\ \underline{+817}\\ 9,804\end{array}$

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b)

$20,21\cdot 7,007=141,61147$

$\begin{array}{r}20,21\\ \underline{\cdot 7,007}\\ 14147\\ \underline{+14147}\\ 141,61147\end{array}$

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c)

$2900\cdot 0,2=290\cdot 2=580$

$\begin{array}{r}290\\ \underline{\cdot 2}\\ 580\end{array}$

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d)

${\left(0,125\right)}^2=0,125\cdot 0,125=0,015625$

$\begin{array}{r}0,125\\ \underline{\cdot 0,125}\\ 625\\ 250\\ \underline{+125}\\ 0,015625\end{array}$

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e)

${\left(0,12\right)}^3=0,12\cdot 0,12\cdot 0,12=0,0144\cdot 0,12=0,001728$

$\begin{array}{r}0,12\\ \underline{\cdot 0,12}\\ 24\\ \underline{+12}\\ 0,0144\end{array}$

$\begin{array}{r}0,0144\\ \underline{\cdot 0,12}\\ 288\\ \underline{+144}\\ 0,001728\end{array}$

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f)

$17\cdot 0,3\cdot 0,012=5,1\cdot 0,0612$

$17\cdot 3=51$

$\begin{array}{r}5,1\\ \underline{\cdot 0,012}\\ 102\\ \underline{+51}\\ 0,0612\end{array}$